I really like using the K2 login module to allow my users to add content, but I don't want them using the com_user registration, so i hacked the modules/mod_k2_login/tmpl/login.php file to meet my needs.

 

First, make sure you have the Community Builder Registration published in your menu. Next, copy the link to that menu item (necessary if you use Joomla SEF). In my case, it is:

 

www.insertyourwebsitenamehere.com/community/login/register.html  (referred to below as URL FROM ABOVE)

 

Then, in the login.php file, on line 45, edit it to read:

 

<li><a href="URL FROM ABOVE"><?php echo JText::_('Create an account'); ?></a></li>

 

Hope it works for you too!